hollandben/grunt-less-themes — pull request #2 by matteofigus (2013-10-24 17:10:52+00:00)
Title: Bugfix

Found the bug.
fs.createReadStream(themePath).pipe(fs.createWriteStream(options.themeImport));

pipe is async, so you need to wait the end of the first read/write if you want if you want to redo a read/write to the same files.

Just wrapping everything on a .on('end'. function(){}) seems to solve the problem. Now it should be ok!